Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Topology optimization of compliant mechanisms subjected to harmonic loads.
Submission Author:
Valéria Farias da Luz , SC
Co-Authors:
Valéria Farias da Luz, Olavo M. Silva, Eduardo Lenz Cardoso
Presenter: Valéria Farias da Luz
doi://10.26678/ABCM.COBEM2023.COB2023-0320
Abstract
Compliant mechanisms are used to modify kinematic and/or kinetic relationships, through the connection between actuators (inputs) and receivers (output) by elastic deformation of the mechanism. In view of the complexity of its geometry, topology optimization is generally used to design a compliant mechanism from scratch. This work proposes a new formulation to design compliant mechanisms subjected to harmonic loads, where the objective is to maximize the harmonic amplitude of the output displacements while constraining input displacements, volume and local harmonic stresses. The Augmented Lagrangian method is used to convert the original constrained problem into an equivalent unconstrained optimization, due to large number of local stress constraints. QP relaxation is used to avoid singularities in stress parameterization and spatial fltering and non-linear projection are used for complexity control. Analytical sensitivities are obtained using the adjoint approach to harmonic equilibrium equations. In this work, the design of an inverter mechanism is used to study the proposed formulation. The results shown the influence of excitation frequency on the topology.
Keywords
Topology optimization, harmonic analysis, Compliant mechanisms
